QUESTION1 which is incorrect statement for gravimetric analysis? -precipitation must be free from soluble impurities -pr

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QUESTION1
which is incorrect statement for gravimetric analysis?
-precipitation must be free from soluble impurities
-precipitates must be convertible into a pure compound
-precipitates may not be readily separated from the solution by
filtration.
-precipitates must be insoluble in solution
QUESTION2
in gravimetric analysis ,heating gently during the
coagulation stage would aid what process
-filtration
-evaporation
-precipitation
-digestion
question 3
in gravimetric analysis
-the mass of a solution is used to calculate the quantity of the
original analyte
-the mass of a product is used to calculate the quantity of the
original analyte
-the mass of the product is used to calculate the quantity of
the impurity
-none of the above
QUESTION 4
which of the following statement is correct 1
.if the RSS is high then the precipitate is small and you get a
colloidal material
2.if the RSS is small then the precipitate is small and you get
a colloidal material
3.if the RSS is high then the precipitate is small and you get a
crystalline material
4.if relative supersaturation is high the the precipitate size
is large and get colloidal